SPDX: Convert single license tags to Linux Kernel style

Fix license tags problem after apply patchs about
riscv: Enable efi_loader support.

Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Cc: Greentime Hu <green.hu@gmail.com>
diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
index 103f359..8f5a6a2 100644
--- a/arch/riscv/lib/setjmp.S
+++ b/arch/riscv/lib/setjmp.S
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) 2018 Alexander Graf <agraf@suse.de>
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <config.h>